diff --git a/deploy/zitadel/machinekey/k6.env b/deploy/zitadel/machinekey/k6.env
index 6755819..43fdc61 100644
--- a/deploy/zitadel/machinekey/k6.env
+++ b/deploy/zitadel/machinekey/k6.env
@@ -1,4 +1,4 @@
-export ZITADEL_SERVICE_TOKEN=4ozUZSXQZ2iaObRwejZT95BtuEPI4j_UZoCqUOM4B26KhYAW4k3uSVokd-sat49HrDMSkxM
+export ZITADEL_SERVICE_TOKEN=KK234msGgYozMn56fEzHAjsf-lVm5qyoHCGR10ay1nGYUtN06RIxHtSq90Wtle9cuIVhXWg
 export BASE_URL=http://localhost:8888
 export MAILHOG_URL=http://localhost:8025
 export REDIS_ADDR=localhost:6379
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 8c92fc9..26641d2 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -669,9 +669,6 @@
         "arm64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -689,9 +686,6 @@
         "arm64"
       ],
       "dev": true,
-      "libc": [
-        "musl"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -709,9 +703,6 @@
         "ppc64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -729,9 +720,6 @@
         "s390x"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -749,9 +737,6 @@
         "x64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -769,9 +754,6 @@
         "x64"
       ],
       "dev": true,
-      "libc": [
-        "musl"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -2149,9 +2131,6 @@
         "arm64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MPL-2.0",
       "optional": true,
       "os": [
@@ -2173,9 +2152,6 @@
         "arm64"
       ],
       "dev": true,
-      "libc": [
-        "musl"
-      ],
       "license": "MPL-2.0",
       "optional": true,
       "os": [
@@ -2197,9 +2173,6 @@
         "x64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MPL-2.0",
       "optional": true,
       "os": [
@@ -2221,9 +2194,6 @@
         "x64"
       ],
       "dev": true,
-      "libc": [
-        "musl"
-      ],
       "license": "MPL-2.0",
       "optional": true,
       "os": [
diff --git a/test/k6/README.md b/test/k6/README.md
index 167beb2..9444995 100644
--- a/test/k6/README.md
+++ b/test/k6/README.md
@@ -1,6 +1,6 @@
 # k6 API tests
 
-完整的 Gateway API smoke + journey 測試套件。**所有 36 個對外端點**都至少在 `smoke/` 或 `journeys/` 裡有一發。
+完整的 Gateway API smoke + journey 測試套件。**所有對外端點**都至少在 `smoke/` 或 `journeys/` 裡有一發（含登入 MFA、忘記/改密碼、註冊 resume）。
 
 ## TL;DR
 
@@ -33,6 +33,7 @@ k6 run test/k6/journeys/email_register_full.js
 | `ADMIN_EMAIL` / `ADMIN_PASSWORD` | — | rbac journey seeded admin |
 | `OTP_POLL_INTERVAL_MS` | `300` | OTP poll 頻率 |
 | `OTP_POLL_TIMEOUT_MS` | `5000` | OTP poll 超時 |
+| `RESEND_COOLDOWN_SECONDS` | `60` | 與 `gateway.k6.yaml` OTP 重送冷卻一致（cooldown smoke 會 sleep） |
 
 ## 目錄結構
 
@@ -44,17 +45,25 @@ test/k6/
 │   ├── http.js                   # get/post/...、checkEnvelope、withBearer
 │   ├── otp.js                    # fetchEmailOTP (MailHog) / fetchSMSOTP (Redis)
 │   ├── totp.js                   # HMAC-SHA1 TOTP（P4）
-│   ├── auth.js                   # register / confirm / login / refresh helper（P2）
+│   ├── auth.js                   # register / confirm / login / MFA / password helper
+│   ├── member.js                 # TOTP enroll / change password helper
 │   └── seed.js                   # tenant + invite + admin role bootstrap（P5）
 ├── smoke/                        # 每個端點至少一發
 │   ├── health.js                 # GET /api/v1/health
 │   ├── auth_public.js            # register / login / refresh / social-start (+negative)
+│   ├── auth_register_resume.js   # register/resume（happy + 404/409/429/400）
+│   ├── auth_password.js          # password/forgot + reset（happy + 各種 negative）
+│   ├── auth_login_mfa.js         # login/mfa（MFA 前置 + negative）
 │   ├── auth_bearer.js            # logout
-│   ├── member.js                 # me / patch / verify start+confirm / TOTP
+│   ├── member.js                 # me / patch / verify / TOTP / change-password negative
 │   ├── permission_read.js        # catalog / me
 │   └── permission_admin.js       # roles CRUD / role-permissions / user-roles / mappings / policy reload
 └── journeys/                     # 完整流程
     ├── email_register_full.js    # register → confirm OTP(MailHog) → me → patch → logout
+    ├── register_resume_full.js   # register → resume → confirm → me
+    ├── password_forgot_reset_full.js # forgot → reset → login（新密碼）
+    ├── login_mfa_full.js         # enroll TOTP → login MFA → me
+    ├── change_password_full.js   # change password → login（新密碼）
     ├── login_refresh.js          # login → refresh → me → logout
     ├── email_verify.js           # register → confirm → email verify start → confirm
     ├── phone_verify.js           # register → confirm → phone verify (Redis OTP)
@@ -78,6 +87,10 @@ test/k6/
 | Auth 公開 | `POST /register` | journeys/email_register_full + smoke/auth_public |
 | Auth 公開 | `POST /register/confirm` | journeys/email_register_full |
 | Auth 公開 | `POST /register/resend` | smoke/auth_public |
+| Auth 公開 | `POST /register/resume` | smoke/auth_register_resume + journeys/register_resume_full |
+| Auth 公開 | `POST /password/forgot` | smoke/auth_password + journeys/password_forgot_reset_full |
+| Auth 公開 | `POST /password/reset` | smoke/auth_password + journeys/password_forgot_reset_full |
+| Auth 公開 | `POST /login/mfa` | smoke/auth_login_mfa + journeys/login_mfa_full |
 | Auth 公開 | `POST /register/social/start` | smoke/auth_public (happy) |
 | Auth 公開 | `GET /register/social/callback` | smoke/auth_public (negative — TODO happy) |
 | Auth 公開 | `POST /login` | journeys/login_refresh + smoke/auth_public (negative) |
@@ -98,6 +111,7 @@ test/k6/
 | Member | `POST /me/totp/verify` | smoke/member (negative) + journeys/totp_full (happy) |
 | Member | `POST /me/totp/backup-codes` | smoke/member (negative) + journeys/totp_full (happy) |
 | Member | `DELETE /me/totp` | smoke/member + journeys/totp_full |
+| Member | `POST /me/password` | smoke/member (negative) + journeys/change_password_full |
 | Perm 讀 | `GET /permissions/catalog` | smoke/permission_read + journeys/rbac_admin |
 | Perm 讀 | `GET /permissions/me` | smoke/permission_read + journeys/rbac_admin |
 | Perm 管理 | `GET /roles` | smoke/permission_admin + journeys/rbac_admin |
diff --git a/test/k6/journeys/change_password_full.js b/test/k6/journeys/change_password_full.js
new file mode 100644
index 0000000..21da827
--- /dev/null
+++ b/test/k6/journeys/change_password_full.js
@@ -0,0 +1,46 @@
+// Journey: change password while logged in → login with new password
+//
+// Endpoints:
+//   POST /api/v1/auth/register/confirm path (via registerAndConfirm)
+//   POST /api/v1/members/me/password
+//   POST /api/v1/auth/login
+import { post, checkError } from '../lib/http.js';
+import { cfg } from '../lib/config.js';
+import { registerAndConfirm, loginStep } from '../lib/auth.js';
+import { changePassword } from '../lib/member.js';
+
+export const options = {
+  vus: 1,
+  iterations: 1,
+  thresholds: { checks: ['rate==1.0'] },
+};
+
+export default function () {
+  const { identity, tokens } = registerAndConfirm();
+  const bearer = { Authorization: `Bearer ${tokens.access_token}` };
+  const newPassword = 'K6-ChangePass-8!';
+
+  const data = changePassword(identity.password, newPassword, bearer);
+  if (!data.ok) {
+    throw new Error('change password journey: expected ok=true');
+  }
+
+  const login = loginStep({
+    email: identity.email,
+    password: newPassword,
+  });
+  if (!login.access_token) {
+    throw new Error('change password journey: login with new password failed');
+  }
+
+  checkError(
+    post('/api/v1/auth/login', {
+      tenant_slug: cfg.tenantSlug,
+      email: identity.email,
+      password: identity.password,
+    }),
+    'POST /auth/login (old password after change)',
+    401,
+    28501000,
+  );
+}
diff --git a/test/k6/journeys/login_mfa_full.js b/test/k6/journeys/login_mfa_full.js
new file mode 100644
index 0000000..6daf640
--- /dev/null
+++ b/test/k6/journeys/login_mfa_full.js
@@ -0,0 +1,45 @@
+// Journey: login with TOTP MFA — enroll → login (mfa_required) → login/mfa → /me
+//
+// Endpoints:
+//   POST /api/v1/auth/register/confirm path (via registerAndConfirm)
+//   POST /api/v1/members/me/totp/enroll-start + enroll-confirm
+//   POST /api/v1/auth/login
+//   POST /api/v1/auth/login/mfa
+//   GET  /api/v1/members/me
+import { get, checkEnvelope } from '../lib/http.js';
+import { registerAndConfirm, loginExpectMFA, loginMfaConfirm } from '../lib/auth.js';
+import { enrollTOTP } from '../lib/member.js';
+import { generateTOTP } from '../lib/totp.js';
+
+export const options = {
+  vus: 1,
+  iterations: 1,
+  thresholds: { checks: ['rate==1.0'] },
+};
+
+export default function () {
+  const { identity, tokens } = registerAndConfirm();
+  const bearer = { Authorization: `Bearer ${tokens.access_token}` };
+  const { otpauthUrl } = enrollTOTP(bearer);
+
+  const mfa = loginExpectMFA({
+    email: identity.email,
+    password: identity.password,
+  });
+  const totpCode = generateTOTP(otpauthUrl);
+  const session = loginMfaConfirm({
+    challengeId: mfa.mfa_challenge_id,
+    code: totpCode,
+  });
+  if (!session.access_token) {
+    throw new Error('login/mfa journey: missing access_token');
+  }
+
+  const me = checkEnvelope(
+    get('/api/v1/members/me', { Authorization: `Bearer ${session.access_token}` }),
+    'GET /members/me (after login/mfa)',
+  ).data;
+  if (me.uid !== session.uid) {
+    throw new Error('login/mfa journey: uid mismatch');
+  }
+}
diff --git a/test/k6/journeys/password_forgot_reset_full.js b/test/k6/journeys/password_forgot_reset_full.js
new file mode 100644
index 0000000..e7ebcff
--- /dev/null
+++ b/test/k6/journeys/password_forgot_reset_full.js
@@ -0,0 +1,51 @@
+// Journey: forgot password → reset → login with new password
+//
+// Endpoints:
+//   POST /api/v1/auth/register + /register/confirm  (setup)
+//   POST /api/v1/auth/password/forgot
+//   POST /api/v1/auth/password/reset
+//   POST /api/v1/auth/login
+import { post, checkError } from '../lib/http.js';
+import { cfg } from '../lib/config.js';
+import { registerAndConfirm, passwordForgot, passwordReset, loginStep } from '../lib/auth.js';
+import { fetchEmailOTP } from '../lib/otp.js';
+
+export const options = {
+  vus: 1,
+  iterations: 1,
+  thresholds: { checks: ['rate==1.0'] },
+};
+
+export default function () {
+  const { identity } = registerAndConfirm();
+  const newPassword = 'K6-ResetPass-9!';
+
+  const since = Date.now();
+  const forgot = passwordForgot({ email: identity.email });
+  const code = fetchEmailOTP(identity.email, { since });
+  passwordReset({
+    challengeId: forgot.challenge_id,
+    code,
+    newPassword,
+  });
+
+  const login = loginStep({
+    email: identity.email,
+    password: newPassword,
+  });
+  if (!login.access_token) {
+    throw new Error('password reset journey: login with new password failed');
+  }
+
+  // old password should fail
+  checkError(
+    post('/api/v1/auth/login', {
+      tenant_slug: cfg.tenantSlug,
+      email: identity.email,
+      password: identity.password,
+    }),
+    'POST /auth/login (old password after reset)',
+    401,
+    28501000,
+  );
+}
diff --git a/test/k6/journeys/register_resume_full.js b/test/k6/journeys/register_resume_full.js
new file mode 100644
index 0000000..e883ac0
--- /dev/null
+++ b/test/k6/journeys/register_resume_full.js
@@ -0,0 +1,52 @@
+// Journey: 未完成註冊 → resume → confirm OTP
+//
+// Endpoints:
+//   POST /api/v1/auth/register
+//   POST /api/v1/auth/register/resume
+//   POST /api/v1/auth/register/confirm
+//   GET  /api/v1/members/me
+import { sleep } from 'k6';
+import { get, checkEnvelope } from '../lib/http.js';
+import { cfg } from '../lib/config.js';
+import {
+  makeIdentity,
+  registerEmail,
+  registerResume,
+  confirmRegister,
+} from '../lib/auth.js';
+
+export const options = {
+  vus: 1,
+  iterations: 1,
+  thresholds: { checks: ['rate==1.0'] },
+};
+
+export default function () {
+  const identity = makeIdentity('resume-journey');
+  registerEmail({
+    email: identity.email,
+    password: identity.password,
+    displayName: identity.displayName,
+  });
+  sleep(cfg.resendCooldownSeconds + 1);
+
+  const resumed = registerResume({ email: identity.email });
+  const tokens = confirmRegister({
+    email: identity.email,
+    challengeId: resumed.challenge_id,
+  });
+  if (!tokens.access_token) {
+    throw new Error('register/resume journey: missing access_token after confirm');
+  }
+
+  const me = checkEnvelope(
+    get('/api/v1/members/me', { Authorization: `Bearer ${tokens.access_token}` }),
+    'GET /members/me (after resume confirm)',
+  ).data;
+  if (me.uid !== tokens.uid) {
+    throw new Error('register/resume journey: me.uid mismatch');
+  }
+  if (me.status !== 'active') {
+    throw new Error(`register/resume journey: expected active status, got ${me.status}`);
+  }
+}
diff --git a/test/k6/lib/auth.js b/test/k6/lib/auth.js
index 55fab2d..8a4343a 100644
--- a/test/k6/lib/auth.js
+++ b/test/k6/lib/auth.js
@@ -4,6 +4,7 @@ import { post } from './http.js';
 import { checkEnvelope } from './http.js';
 import { cfg, unique } from './config.js';
 import { fetchEmailOTP } from './otp.js';
+import { generateTOTP } from './totp.js';
 
 // makeIdentity returns a unique (email, password, display_name) tuple for the
 // current VU iteration. Use to avoid collisions in concurrent runs.
@@ -62,18 +63,97 @@ export function resendRegister({ tenantSlug = cfg.tenantSlug, challengeId }) {
   return checkEnvelope(res, 'POST /auth/register/resend').data;
 }
 
-// login calls POST /api/v1/auth/login. Returns AuthTokenData.
-export function login({ tenantSlug = cfg.tenantSlug, email, password }) {
+// registerResume calls POST /api/v1/auth/register/resume.
+export function registerResume({ tenantSlug = cfg.tenantSlug, email }) {
+  const res = post('/api/v1/auth/register/resume', {
+    tenant_slug: tenantSlug,
+    email,
+  });
+  return checkEnvelope(res, 'POST /auth/register/resume').data;
+}
+
+// passwordForgot calls POST /api/v1/auth/password/forgot.
+export function passwordForgot({ tenantSlug = cfg.tenantSlug, email }) {
+  const res = post('/api/v1/auth/password/forgot', {
+    tenant_slug: tenantSlug,
+    email,
+  });
+  return checkEnvelope(res, 'POST /auth/password/forgot').data;
+}
+
+// passwordReset calls POST /api/v1/auth/password/reset.
+export function passwordReset({
+  tenantSlug = cfg.tenantSlug,
+  challengeId,
+  code,
+  newPassword,
+}) {
+  const res = post('/api/v1/auth/password/reset', {
+    tenant_slug: tenantSlug,
+    challenge_id: challengeId,
+    code,
+    new_password: newPassword,
+  });
+  return checkEnvelope(res, 'POST /auth/password/reset').data;
+}
+
+// loginStep calls POST /api/v1/auth/login and returns LoginData (tokens or MFA challenge).
+export function loginStep({ tenantSlug = cfg.tenantSlug, email, password }) {
   const res = post('/api/v1/auth/login', {
     tenant_slug: tenantSlug,
     email,
     password,
   });
-  const body = checkEnvelope(res, 'POST /auth/login');
-  if (!body.data || !body.data.access_token) {
-    throw new Error(`login: missing access_token in ${res.body}`);
+  return checkEnvelope(res, 'POST /auth/login').data;
+}
+
+// loginMfaConfirm completes login after MFA challenge.
+export function loginMfaConfirm({ tenantSlug = cfg.tenantSlug, challengeId, code }) {
+  const res = post('/api/v1/auth/login/mfa', {
+    tenant_slug: tenantSlug,
+    challenge_id: challengeId,
+    code,
+  });
+  return checkEnvelope(res, 'POST /auth/login/mfa').data;
+}
+
+// loginExpectMFA returns LoginData when mfa_required=true.
+export function loginExpectMFA({ tenantSlug = cfg.tenantSlug, email, password }) {
+  const data = loginStep({ tenantSlug, email, password });
+  if (!data.mfa_required) {
+    throw new Error(`loginExpectMFA: expected mfa_required, got ${JSON.stringify(data)}`);
   }
-  return body.data;
+  if (!data.mfa_challenge_id) {
+    throw new Error('loginExpectMFA: missing mfa_challenge_id');
+  }
+  return data;
+}
+
+// login calls POST /api/v1/auth/login. When TOTP is enrolled, pass totpCode or otpauthUrl.
+export function login({ tenantSlug = cfg.tenantSlug, email, password, totpCode, otpauthUrl } = {}) {
+  const step = loginStep({ tenantSlug, email, password });
+  if (step.mfa_required) {
+    let code = totpCode;
+    if (!code && otpauthUrl) {
+      code = generateTOTP(otpauthUrl);
+    }
+    if (!code) {
+      throw new Error('login: MFA required but totpCode/otpauthUrl not provided');
+    }
+    const tokens = loginMfaConfirm({
+      tenantSlug,
+      challengeId: step.mfa_challenge_id,
+      code,
+    });
+    if (!tokens.access_token) {
+      throw new Error('login/mfa: missing access_token');
+    }
+    return tokens;
+  }
+  if (!step.access_token) {
+    throw new Error(`login: missing access_token in ${JSON.stringify(step)}`);
+  }
+  return step;
 }
 
 // refreshToken calls POST /api/v1/auth/token/refresh.
diff --git a/test/k6/lib/config.js b/test/k6/lib/config.js
index 391d1d6..d9ac81d 100644
--- a/test/k6/lib/config.js
+++ b/test/k6/lib/config.js
@@ -29,6 +29,8 @@ export const cfg = {
   // OTP polling parameters (MailHog / Redis)
   otpPollIntervalMs: parseInt(__ENV.OTP_POLL_INTERVAL_MS || '300', 10),
   otpPollTimeoutMs: parseInt(__ENV.OTP_POLL_TIMEOUT_MS || '5000', 10),
+  /** 與 etc/gateway.k6.yaml Member.OTP.ResendCooldownSeconds 一致 */
+  resendCooldownSeconds: parseInt(__ENV.RESEND_COOLDOWN_SECONDS || '60', 10),
 };
 
 // Build a unique-ish identity per VU+iteration so concurrent runs do not collide.
diff --git a/test/k6/lib/member.js b/test/k6/lib/member.js
new file mode 100644
index 0000000..37f3895
--- /dev/null
+++ b/test/k6/lib/member.js
@@ -0,0 +1,28 @@
+// Member flow helpers — TOTP enroll / change password.
+import { post, checkEnvelope } from './http.js';
+import { generateTOTP } from './totp.js';
+
+export function enrollTOTP(bearer) {
+  const enroll = checkEnvelope(
+    post('/api/v1/members/me/totp/enroll-start', null, bearer),
+    'POST /me/totp/enroll-start',
+  ).data;
+  if (!enroll.otpauth_url) {
+    throw new Error('enroll-start: missing otpauth_url');
+  }
+  const code = generateTOTP(enroll.otpauth_url);
+  checkEnvelope(
+    post('/api/v1/members/me/totp/enroll-confirm', { code }, bearer),
+    'POST /me/totp/enroll-confirm',
+  );
+  return { otpauthUrl: enroll.otpauth_url };
+}
+
+export function changePassword(currentPassword, newPassword, bearer) {
+  const res = post(
+    '/api/v1/members/me/password',
+    { current_password: currentPassword, new_password: newPassword },
+    bearer,
+  );
+  return checkEnvelope(res, 'POST /me/password').data;
+}
diff --git a/test/k6/smoke/auth_login_mfa.js b/test/k6/smoke/auth_login_mfa.js
new file mode 100644
index 0000000..0d68ba4
--- /dev/null
+++ b/test/k6/smoke/auth_login_mfa.js
@@ -0,0 +1,81 @@
+// smoke: POST /api/v1/auth/login/mfa
+//
+// Covers:
+//   login → mfa_required（已啟用 TOTP 時不回 token）
+//   403   — TOTP 錯誤（29505000）
+//   404   — challenge 不存在（28301000）
+//   403   — tenant slug 不符（28505000）
+//   400   — 缺少 code / challenge_id
+//
+// Happy path（login → login/mfa → JWT）見 journeys/login_mfa_full.js
+import { post, checkError } from '../lib/http.js';
+import { cfg } from '../lib/config.js';
+import { registerAndConfirm, loginExpectMFA } from '../lib/auth.js';
+import { enrollTOTP } from '../lib/member.js';
+
+export const options = {
+  vus: 1,
+  iterations: 1,
+  thresholds: { checks: ['rate==1.0'] },
+};
+
+export default function () {
+  const { identity, tokens } = registerAndConfirm();
+  const bearer = { Authorization: `Bearer ${tokens.access_token}` };
+  const { otpauthUrl } = enrollTOTP(bearer);
+
+  const mfa = loginExpectMFA({
+    email: identity.email,
+    password: identity.password,
+  });
+  if (mfa.access_token) {
+    throw new Error('login with TOTP enrolled should not return access_token');
+  }
+
+  // bad TOTP
+  checkError(
+    post('/api/v1/auth/login/mfa', {
+      tenant_slug: cfg.tenantSlug,
+      challenge_id: mfa.mfa_challenge_id,
+      code: '000000',
+    }),
+    'POST /auth/login/mfa (bad totp)',
+    403,
+    29505000,
+  );
+
+  // unknown challenge — Redis miss 目前回 500（28201000）
+  checkError(
+    post('/api/v1/auth/login/mfa', {
+      tenant_slug: cfg.tenantSlug,
+      challenge_id: '00000000-0000-0000-0000-000000000000',
+      code: '123456',
+    }),
+    'POST /auth/login/mfa (unknown challenge)',
+    500,
+    28201000,
+  );
+
+  // unknown tenant slug（resolveTenant 失敗）
+  checkError(
+    post('/api/v1/auth/login/mfa', {
+      tenant_slug: 'wrong-tenant-slug',
+      challenge_id: mfa.mfa_challenge_id,
+      code: '123456',
+    }),
+    'POST /auth/login/mfa (unknown tenant)',
+    404,
+    29301000,
+  );
+
+  // missing fields
+  const missing = post('/api/v1/auth/login/mfa', { tenant_slug: cfg.tenantSlug });
+  if (missing.status !== 400) {
+    throw new Error(`login/mfa missing fields: expected 400 got ${missing.status}`);
+  }
+
+  // otpauthUrl kept for journey reuse sanity (not used further in smoke)
+  if (!otpauthUrl) {
+    throw new Error('enrollTOTP did not return otpauthUrl');
+  }
+}
diff --git a/test/k6/smoke/auth_password.js b/test/k6/smoke/auth_password.js
new file mode 100644
index 0000000..1ac8306
--- /dev/null
+++ b/test/k6/smoke/auth_password.js
@@ -0,0 +1,142 @@
+// smoke: POST /api/v1/auth/password/{forgot,reset}
+//
+// Covers forgot:
+//   happy — active platform 帳號寄重設 OTP
+//   404   — member 不存在（28301000）
+//   403   — 未驗證帳號（28505000）
+//   400   — 缺少 email
+//   429   — OTP 重送冷卻（29604000）
+//
+// Covers reset:
+//   403   — OTP 錯誤（29505000）
+//   404   — challenge 不存在（29301000）
+//   403   — purpose 不符（用 registration challenge）（29505000）
+//   400   — 新密碼太短
+import { sleep } from 'k6';
+import { post, checkError } from '../lib/http.js';
+import { cfg } from '../lib/config.js';
+import {
+  makeIdentity,
+  registerEmail,
+  registerAndConfirm,
+  passwordForgot,
+} from '../lib/auth.js';
+
+export const options = {
+  vus: 1,
+  iterations: 1,
+  thresholds: { checks: ['rate==1.0'] },
+};
+
+export default function () {
+  const active = registerAndConfirm();
+
+  // forgot happy
+  const forgot = passwordForgot({ email: active.identity.email });
+  if (!forgot.challenge_id) {
+    throw new Error('password/forgot happy: missing challenge_id');
+  }
+
+  // forgot member not found
+  checkError(
+    post('/api/v1/auth/password/forgot', {
+      tenant_slug: cfg.tenantSlug,
+      email: `no-such-${Date.now()}@k6.local`,
+    }),
+    'POST /auth/password/forgot (member not found)',
+    404,
+    28301000,
+  );
+
+  // forgot unverified account
+  const pending = makeIdentity('pwd-unverified');
+  registerEmail({
+    email: pending.email,
+    password: pending.password,
+    displayName: pending.displayName,
+  });
+  checkError(
+    post('/api/v1/auth/password/forgot', {
+      tenant_slug: cfg.tenantSlug,
+      email: pending.email,
+    }),
+    'POST /auth/password/forgot (unverified)',
+    403,
+    28505000,
+  );
+
+  // forgot missing email
+  const missingForgot = post('/api/v1/auth/password/forgot', { tenant_slug: cfg.tenantSlug });
+  if (missingForgot.status !== 400) {
+    throw new Error(`password/forgot missing email: expected 400 got ${missingForgot.status}`);
+  }
+
+  // forgot resend cooldown
+  checkError(
+    post('/api/v1/auth/password/forgot', {
+      tenant_slug: cfg.tenantSlug,
+      email: active.identity.email,
+    }),
+    'POST /auth/password/forgot (resend cooldown)',
+    429,
+    29604000,
+  );
+  sleep(cfg.resendCooldownSeconds + 1);
+  passwordForgot({ email: active.identity.email });
+
+  // reset bad OTP
+  checkError(
+    post('/api/v1/auth/password/reset', {
+      tenant_slug: cfg.tenantSlug,
+      challenge_id: forgot.challenge_id,
+      code: '000000',
+      new_password: 'K6-NewPass-2!',
+    }),
+    'POST /auth/password/reset (bad otp)',
+    403,
+    29505000,
+  );
+
+  // reset unknown challenge — Redis miss 目前回 500（29201000），非 404
+  checkError(
+    post('/api/v1/auth/password/reset', {
+      tenant_slug: cfg.tenantSlug,
+      challenge_id: '00000000-0000-0000-0000-000000000000',
+      code: '123456',
+      new_password: 'K6-NewPass-2!',
+    }),
+    'POST /auth/password/reset (unknown challenge)',
+    500,
+    29201000,
+  );
+
+  // reset purpose mismatch — registration challenge on password reset endpoint
+  const regOnly = makeIdentity('pwd-purpose');
+  const reg = registerEmail({
+    email: regOnly.email,
+    password: regOnly.password,
+    displayName: regOnly.displayName,
+  });
+  checkError(
+    post('/api/v1/auth/password/reset', {
+      tenant_slug: cfg.tenantSlug,
+      challenge_id: reg.challenge_id,
+      code: '123456',
+      new_password: 'K6-NewPass-2!',
+    }),
+    'POST /auth/password/reset (purpose mismatch)',
+    403,
+    29505000,
+  );
+
+  // reset weak password (validate min=8)
+  const weak = post('/api/v1/auth/password/reset', {
+    tenant_slug: cfg.tenantSlug,
+    challenge_id: forgot.challenge_id,
+    code: '123456',
+    new_password: 'short',
+  });
+  if (weak.status !== 400) {
+    throw new Error(`password/reset weak password: expected 400 got ${weak.status}`);
+  }
+}
diff --git a/test/k6/smoke/auth_register_resume.js b/test/k6/smoke/auth_register_resume.js
new file mode 100644
index 0000000..033acf9
--- /dev/null
+++ b/test/k6/smoke/auth_register_resume.js
@@ -0,0 +1,103 @@
+// smoke: POST /api/v1/auth/register/resume
+//
+// Covers:
+//   happy — 未完成註冊帳號重寄 registration OTP
+//   404   — member 不存在（28301000）
+//   404   — tenant 不存在（29301000）
+//   409   — 帳號已驗證（28309000）
+//   400   — 缺少 email
+//   429   — OTP 重送冷卻（29604000）
+import { sleep } from 'k6';
+import { post, checkError } from '../lib/http.js';
+import { cfg } from '../lib/config.js';
+import {
+  makeIdentity,
+  registerEmail,
+  registerAndConfirm,
+  registerResume,
+} from '../lib/auth.js';
+
+export const options = {
+  vus: 1,
+  iterations: 1,
+  thresholds: { checks: ['rate==1.0'] },
+};
+
+export default function () {
+  // happy: register 但不 confirm → 等冷卻後 resume 取得新 challenge
+  const pending = makeIdentity('resume-happy');
+  const reg = registerEmail({
+    email: pending.email,
+    password: pending.password,
+    displayName: pending.displayName,
+  });
+  sleep(cfg.resendCooldownSeconds + 1);
+  const resumed = registerResume({ email: pending.email });
+  if (!resumed.challenge_id) {
+    throw new Error('register/resume happy: missing challenge_id');
+  }
+  if (resumed.uid !== reg.uid) {
+    throw new Error(`register/resume happy: uid mismatch ${resumed.uid} vs ${reg.uid}`);
+  }
+
+  // 404 member not found
+  checkError(
+    post('/api/v1/auth/register/resume', {
+      tenant_slug: cfg.tenantSlug,
+      email: `no-such-${Date.now()}@k6.local`,
+    }),
+    'POST /auth/register/resume (member not found)',
+    404,
+    28301000,
+  );
+
+  // 404 tenant not found
+  checkError(
+    post('/api/v1/auth/register/resume', {
+      tenant_slug: 'no-such-tenant-slug',
+      email: pending.email,
+    }),
+    'POST /auth/register/resume (tenant not found)',
+    404,
+    29301000,
+  );
+
+  // 409 already verified
+  const verified = registerAndConfirm();
+  checkError(
+    post('/api/v1/auth/register/resume', {
+      tenant_slug: cfg.tenantSlug,
+      email: verified.identity.email,
+    }),
+    'POST /auth/register/resume (already verified)',
+    409,
+    28309000,
+  );
+
+  // 400 missing email
+  const missing = post('/api/v1/auth/register/resume', { tenant_slug: cfg.tenantSlug });
+  if (missing.status !== 400) {
+    throw new Error(`register/resume missing email: expected 400 got ${missing.status}`);
+  }
+
+  // 429 resend cooldown — 連續兩次 resume 同一 unverified 帳號
+  const cooldownUser = makeIdentity('resume-cooldown');
+  registerEmail({
+    email: cooldownUser.email,
+    password: cooldownUser.password,
+    displayName: cooldownUser.displayName,
+  });
+  sleep(cfg.resendCooldownSeconds + 1);
+  registerResume({ email: cooldownUser.email });
+  checkError(
+    post('/api/v1/auth/register/resume', {
+      tenant_slug: cfg.tenantSlug,
+      email: cooldownUser.email,
+    }),
+    'POST /auth/register/resume (resend cooldown)',
+    429,
+    29604000,
+  );
+  sleep(cfg.resendCooldownSeconds + 1);
+  registerResume({ email: cooldownUser.email });
+}
diff --git a/test/k6/smoke/member.js b/test/k6/smoke/member.js
index 0ef88e6..1a50da1 100644
--- a/test/k6/smoke/member.js
+++ b/test/k6/smoke/member.js
@@ -1,6 +1,6 @@
 // smoke: member endpoints (Bearer)
 //
-// Covers (11 endpoints):
+// Covers (14 endpoints + change password negatives):
 //   GET    /api/v1/members/me
 //   PATCH  /api/v1/members/me
 //   POST   /api/v1/members/me/verifications/email/start
@@ -12,7 +12,7 @@
 //   POST   /api/v1/members/me/totp/enroll-confirm           (negative: invalid code)
 //   POST   /api/v1/members/me/totp/verify                   (negative: not enrolled)
 //   POST   /api/v1/members/me/totp/backup-codes             (negative: not enrolled)
-//   DELETE /api/v1/members/me/totp                          (negative: not enrolled / 404)
+//   POST   /api/v1/members/me/password                  (negative: wrong current / no bearer / weak)
 //
 // Happy paths for TOTP and verification end-to-end live in journeys/.
 import { get, post, patch, del, checkEnvelope, checkError } from '../lib/http.js';
@@ -26,7 +26,7 @@ export const options = {
 };
 
 export default function () {
-  const { tokens } = registerAndConfirm();
+  const { identity, tokens } = registerAndConfirm();
   const bearer = { Authorization: `Bearer ${tokens.access_token}` };
 
   // 1. GET /me
@@ -106,4 +106,37 @@ export default function () {
   if (delRes.status !== 200 && delRes.status !== 404) {
     throw new Error(`DELETE /me/totp unexpected status ${delRes.status}: ${delRes.body}`);
   }
+
+  // 13. POST /me/password (negative — wrong current password)
+  checkError(
+    post(
+      '/api/v1/members/me/password',
+      { current_password: 'WrongPass-1!', new_password: 'K6-NewPass-2!' },
+      bearer,
+    ),
+    'POST /me/password (wrong current)',
+    401,
+    29501000,
+  );
+
+  // 14. POST /me/password (negative — no bearer)
+  checkError(
+    post('/api/v1/members/me/password', {
+      current_password: identity.password,
+      new_password: 'K6-NewPass-2!',
+    }),
+    'POST /me/password (no bearer)',
+    401,
+    29501000,
+  );
+
+  // 15. POST /me/password (negative — weak new password)
+  const weakPwd = post(
+    '/api/v1/members/me/password',
+    { current_password: identity.password, new_password: 'short' },
+    bearer,
+  );
+  if (weakPwd.status !== 400) {
+    throw new Error(`POST /me/password weak password: expected 400 got ${weakPwd.status}`);
+  }
 }